Improvement in machines for threading and cutting off gas-pipesy



MACHINES FOR 'rn No.173,1'90.

2 Sheets-Sheet 1.

L. WJSTOCKWELL' READING AND CUTTING OFF GAS-PIPES.

Patented Feb. 8,1876.

W Jim \u SM -Z Sheets-Sheet L. w. s'rocKwELL'. v MACHINES FOR THREADIN G AND CUTTING OFF GAS-PIPES.

Patented Feb. 8, 1876 Fi i.

N- PETERS, PHDTO-LITNUGRAPHER. WSNING'TON. D. C.

UNITED STATES PATENT OFFICE.

LEVI w. sTooKwELL, .OF RAVENNA, OHIO.

IMPROVEMENTlN MACHINES FOB THREADINQ AND CUTTING OFF GAS-PIPES}, 1

Specification forming part of Letters Patent No. 173,190, dated February 8, 1876 application filed Jul ei, 1875. 1

To all whom it'may concern:

Be it known that I, LEVI W. SrooKwELL, of Ravenna, Portage county, Ohio, have in vented certain Improvements in Machines for 2-isa sectional view of the machine. Fig, 3

represents the interior 'sideof the cam-ring, which operates the threading-dies.

The handles h h areattached to opposite sides of the circular frameor ring a, to which all the operating parts are attached. The

' frame a has a central hole through which the pipe to be threaded passes. There is a circular groove, b and cl, in each end of the frame.

The cam -rings 0 and l are "placed against the ends-of the frame a, and held in position by the face-plates g and 'p,,so that they. may be turned by means of their handles it and t, to adjust the dies and guides and cutting-off tool. The face-plates g and p are fastened by screws to the ends of theframe a. The concentric cams, on the. cam-rings c and t, enter the circular grooves in the ends of the frame a. The cams on the ring ,0 enter notches in I thev dies m m m m, the dies passing radially through the sides of the frame a." The dies are moved to and from the center of the frame a, and adjusted by turning the camring 0 by its handle k. The guides s s 8 pass radially, or nearly so, through the sides of the frame a and its groove d. The guides are notched or grooved across one side, the same as the dies. The concentric cams on the interior side of the cam-riugi enter the iiotches in the guides,

so that by turning the cam-ring i by means 1 of its handle l, the guides are .moved to and from the center and adjusted. The guide .9 is grooved lengthwise'on one side, and iuthis groove is placed the tool 0, which is used to cut oif the-pipe. The guides s s s are not quite in line with the center of the machine,

but so that the cutting-point of the tool 0 will be in a proper condition to cut the pipe.

The tool 0 projects beyond the outer end of the guide 8, and passesthrough the toolholder t, in which it is firmly held by a set-screw or other suitable means. The holder t is placed between two shoulders on the thumbscrew w, which enters the end of the guide s. By turningthe thumb-screw w in the guide 8,

the holder t and tool 0 aremoved toward or I y 'from the pipe and adjusted. -The tool ois also adjusted in its holder t to compensate for wear. When the diesare-operating the tool 5 '0 is Withdrawn by the thumb-screw w so that its point is within the guide 8. When the tool 0 is operating, the dies are withdrawn.

The thumb 'screws w 'w 'pass through the bar so and screw into the sides of frame a. J When the guides anddies are properly adjusted the thumb-screws 20 w may be turned'so as to press the bar 00 against the circumferences of the cam-rings c and i, and hold them firmlyv in position. For this purpose the camrrings c andi arev made to extend slightly beyond the frame a. Scales may be marked at the junction of the cam-ring c and face-plate g,

and of the cam-ring 1; and face-plate p, to indicate the proper-adjustments. When the machine is operated to thread pipe or bolts, the point of'tool 0 is withdrawn within the guide 8 by-turning the screw w. The handle I is turned till: the guide 8 s, s touch the pipe or bolt. The handle 16 is turned till the dies are'properly adjusted. Thebar a is then pressed against the cam-rings .cand t'by turn;

ing the screws 20 w". The operator then grasps the handles h h and threads the pipe. When the pipe is threaded the operator turnsthe screw w? to relieve the pressure on the cam-ring c, and then turns the handle k'to' throw out the dies and permit the pipe to be removed. When the pipe is to be cut off the dies are first withdrawn; The guides are moved in againstthe pipe, and held there by tightening the screw 1w against thebar w. The cutting-tool 0 is pressed against the pipe by turning the screw u; at each revolution of Y the cutting-tool, until the pipe is cut'ofi'. The

guides hold the pipe in position while it is being severed, and the guide swhichtouches the pipe, forms a firm support for the tool 0 r at that point. When the dies are operating the guides keep them in proper position to cut a true and uniform thread. Thereis a sufficient space between each cam and the adjaholder t, and screwlw, substantially as and forthe purpose herein set forth.

3. The bar as, in combination with the camrings 0 and i, substantially as and for the purpose herein set forth.

LEVI W. STOOKWELL.

Witnesses BRADFORD HOWLAND, E. P. WILMoT', 

